|
| TABLE 6 | ||||||||||
| RAW MATERIALS USED IN PRODUCING CLINKER AND CEMENT IN THE UNITED STATES1, 2 | ||||||||||
| (Thousand metric tons) | ||||||||||
| 2005 | 2006 | |||||||||
| Raw materials | Clinker | Cement3 | Clinker | Cement3 | ||||||
| Calcareous: | ||||||||||
| Limestone (includes aragonite, marble, chalk, coral) | 114,000 | 2,230 | 114,000 | 2,380 | ||||||
| Cement rock (includes marl) | 11,300 | 2 | 13,300 | 52 | ||||||
| Cement kiln dust (CKD)4 | 334 | 414 | 178 | 364 | ||||||
| Lime5 | 9 | 30 | 121 | 21 | ||||||
| Other | 26 | 21 | 22 | 19 | ||||||
| Aluminous: | ||||||||||
| Clay | 4,790 | -- | 4,770 | -- | ||||||
| Shale | 3,780 | 30 | 3,010 | 37 | ||||||
| Other6 | 721 | -- | 637 | -- | ||||||
| Ferrous: | ||||||||||
| Iron ore | 813 | -- | 752 | -- | ||||||
| Mill scale | 656 | -- | 754 | -- | ||||||
| Other7 | 84 | -- | 55 | -- | ||||||
| Siliceous: | ||||||||||
| Sand and calcium silicate | 3,010 | -- | 3,620 | -- | ||||||
| Sandstone, quartzite, soils, other | 950 | -- | 1,030 | -- | ||||||
| Fly ash | 2,950 | 153 | 2,950 | 130 | ||||||
| Other ash, including bottom ash | 1,210 | -- | 1,190 | --� | ||||||
| Granulated blast furnace slag8 | 144 | 521 | 207 | 678 | ||||||
| Other blast furnace slag | 255 | -- | 324 | -- | ||||||
| Steel slag | 525 | -- | 490 | -- | ||||||
| Other slags | 58 | 2 | 145 | 2 | ||||||
| Natural rock pozzolans9 | -- | 8 | -- | 15 | ||||||
| Other pozzolans10 | 222 | 62 | 139 | 14 | ||||||
| Other: | ||||||||||
| Gypsum and anhydrite | -- | 5,370 | -- | 5,440 | ||||||
| Other, n.e.c.11 | 84 | 108 | 66 | 92 | ||||||
| Total12 | 146,000 | 8,940 | 148,000 | 9,240 | ||||||
| Clinker, imported, raw materials equivalent13 | -- | 4,750 | -- | 4,210 | ||||||
| Grand total12 | 146,000 | 13,700 | 148,000 | 13,500 | ||||||
| -- Zero. | ||||||||||
| 1Excludes Puerto Rico. | ||||||||||
| 2Data have been rounded to three significant digits to reflect inherent reporting accuracy and the incorporation | ||||||||||
| of estimates for some facilities. | ||||||||||
| 3Includes portland, blended, and masonry cements. | ||||||||||
| 4Data are underreported. | ||||||||||
| 5Data are probably underreported, especially regarding incorporation within masonry cements. | ||||||||||
| 6Includes alumina, aluminum dross, bauxite, catalysts, staurolite, and other materials. | ||||||||||
| 7Includes iron sludges, pyrite, and other materials. | ||||||||||
| 8Includes both ground (GGBFS) and unground material. | ||||||||||
| 9Includes pozzolana and burned clays and shales except where reported directly as clay or shale. | ||||||||||
| 10Includes diatomite, silica fume, other microcrystalline silica, and other pozzolans, even if not used as such. | ||||||||||
| 11Not elsewhere classified. Includes fluorspar. | ||||||||||
| 12Data may not add to totals shown because of independent rounding. | ||||||||||
| 13Converted as the weight of foreign clinker consumed times 1.7. | ||||||||||
Source: United States Geological Survey Mineral Resources Program